When JC first meets Miguel, the NSF soldier already knows, more or less, who JC is, acknowledging JC as the "spy they caught." If JC is injured, Miguel will provide him with a medkit which he had smuggled in. Initially, Miguel is armed with a combat knife (something else he had managed to smuggle in). In Biomod/Shifter, he is capable of acquiring other weapons from the bodies of killed or unconscious MJ12 and UNATCO troopers.

Throughout escaping from the MJ12 base and the UNATCO headquarters, JC can order Miguel to follow and cover him, stay where he is, or make a break for it himself. It is possible for Miguel to die, although his death will have no effect on the game's plot. If Miguel escapes to the helicopter successfully, he will stop accompanying JC and the two will part ways, with Miguel thanking JC and wishing him good luck. If Miguel escapes, his eventual fate is unknown, although it is probable that he escapes from Liberty Island (or make contact with the partially reachable thug appearing on the way towards the north dock).

Having a Spanish accent, it is presumed that Miguel is of Hispanic heritage. His face is never seen, as he is only seen wearing the usual NSF body armor. Miguel has an appearance identical to any NSF terrorist in-game.

Even though the NSF is still operational as an organization, Miguel is the last NSF soldier JC will meet in-game.

Miguel possesses a straightforward, obedient and very optimistic personality (even reassuring JC Denton that the former believes they can "make it" out), demonstrated by his willingness to escape, as well as obey JC's orders.

It is unknown why Miguel was being held in the MJ12 base's detention block, and not the UNATCO headquarters prison. This may imply he has a higher rank in the NSF than it seems, or that he knows some sort of sensitive information.